Great condition
Got it here with authentication. Previous seller said it’s new without tag, and I tried it once.
Amazing silhouette but too big for me.
It is Isabel Marant 34 = UK6 but it is loose fit and can be worn cinched with belt or without.
The brand webpage says
Isabel Marant's 'Cilabadi' jacket is made from lightweight shell that's padded to create a puffy shape. It has a neat shawl collar and pleats at the shoulders that enhance the volume of the sleeves. Use the self-tie belt to cinch the loose silhouette.
85% Polyester 15% Cotton